Checking for an empty field with MySQL

Question

I\'ve wrote a query to check for users with certain criteria, one being they have an email address.

Our site will allow a user to have or not have an email address.<

Answer 1

check this code for the problem:

$sql = "SELECT * FROM tablename WHERE condition";

$res = mysql_query($sql);

while ($row = mysql_fetch_assoc($res)) {

    foreach($row as $key => $field) {  

        echo "
";

        if(empty($row[$key])){

            echo $key." : empty field :"."
"; 

        }else{

        echo $key." =" . $field."
";     

        }
    }
}